Please note that Kaiten currently does NOT support Exchange ActiveSync.

★★★ Use Kaiten for free ★★★

If you want to try Kaiten out for free (or just use it forever for free) try out the ad-supported version here: http://play.google.com/store/apps/details?id=com.kaitenmail.adsupported

★★★ Support ★★★

If you're having trouble with Kaiten, drop us a line and we'll do everything we can to help you out. We'd love to hear how you'd like Kaiten to improve. Join us at http://kaitenmail.uservoice.com/

★★★ Kaiten's origin ★★★

Kaiten is based on the popular open source app K-9 Mail and was built by K-9's lead developers Jesse and Chris. By buying Kaiten you not only get an awesome email client, you also support the open source version because almost all of the new features are contributed to K-9 Mail.

The name is a play on K-9. Kaiten is a Japanese word that means rotation and sounds a lot like K10 or K-10.

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Absolutely zero customer service! I have written to them three times over the last 5 weeks and they do not respond. They got my money and now they don't care. I will uninstall and go to k-9 or stock or something else that actually cares about their customers. Enough is enough.

Flexible, versatile email client Kaiten works well for my needs. Lets me use a preferred from address other than my IMAP server, for example. -1 only for current problem: some messages show null content on first try. Skipping forward and back shows correct content.

A Google User

Move functionality has a small bug + feature requests 1.Every time I move a mail to a folder, the next time I want to move a mail, the previously selected folder is shifted one up, means I have to scroll one up again. 2. Support for colored html mails would be great (viewing them as priority). 3. Server search (IMAP) isn't very reliable / could be improved

Loved it but not any more This was far superior to its K-9 cousin when purchased 3 years ago. But alas it has not been updated in a year and tech support messages go unanswered. The latest Android 5 has broken Kaiten and email text no longer displays unless you flip the phone to landscape and back again. So what to do? I exported my Kaiten settings, downloaded the latest K-9 app and imported the Kaiten settings. Voila! K-9 seems to have benefitted from all of the Kaiten updates and looks identical to me. AND IT WORKS + it's free.

Crashes Crashes seem to be more frequent. I now can't file messages in different folders-a fairly fundamental requirement. So I'm going to have to look for a new mail client unfortunately. I have reported the issue several times but can only wait so long for a fix.

The APG integration should be improved. Through the additional app "APG", Kaiten is supposed not just to let us sign outgoing, but also to verify the signatures on incoming emails. However, the lack of PGP/MIME support means that in this case, signing an email is always done with an ancient inline, pure-text method - which Kaiten interprets correctly as a PGP signature on incoming mail as well then. But it fails to recognize .ASC attachments and application/pgp-signature , as potential PGP signatures. And so in today's world we don't know whether incoming emails are even signed or not, which it needs to recognize, to be able to tell us whether the signature is valid. Only recognizes its own. Even so, an above-average app, for a user with above-average expectations.

Absolutely zero customer service! I have written to them three times over the last 5 weeks and they do not respond. They got my money and now they don't care. I will uninstall and go to k-9 or stock or something else that actually cares about their customers. Enough is enough.

Flexible, versatile email client Kaiten works well for my needs. Lets me use a preferred from address other than my IMAP server, for example. -1 only for current problem: some messages show null content on first try. Skipping forward and back shows correct content.

Move functionality has a small bug + feature requests 1.Every time I move a mail to a folder, the next time I want to move a mail, the previously selected folder is shifted one up, means I have to scroll one up again. 2. Support for colored html mails would be great (viewing them as priority). 3. Server search (IMAP) isn't very reliable / could be improved

Loved it but not any more This was far superior to its K-9 cousin when purchased 3 years ago. But alas it has not been updated in a year and tech support messages go unanswered. The latest Android 5 has broken Kaiten and email text no longer displays unless you flip the phone to landscape and back again. So what to do? I exported my Kaiten settings, downloaded the latest K-9 app and imported the Kaiten settings. Voila! K-9 seems to have benefitted from all of the Kaiten updates and looks identical to me. AND IT WORKS + it's free.

Crashes Crashes seem to be more frequent. I now can't file messages in different folders-a fairly fundamental requirement. So I'm going to have to look for a new mail client unfortunately. I have reported the issue several times but can only wait so long for a fix.

The APG integration should be improved. Through the additional app "APG", Kaiten is supposed not just to let us sign outgoing, but also to verify the signatures on incoming emails. However, the lack of PGP/MIME support means that in this case, signing an email is always done with an ancient inline, pure-text method - which Kaiten interprets correctly as a PGP signature on incoming mail as well then. But it fails to recognize .ASC attachments and application/pgp-signature , as potential PGP signatures. And so in today's world we don't know whether incoming emails are even signed or not, which it needs to recognize, to be able to tell us whether the signature is valid. Only recognizes its own. Even so, an above-average app, for a user with above-average expectations.

Best Android email app...but no Exchange support I've tested all Android email apps, including K-9 Mail. Kaiten has the best functionality, workflows and interface. In addition, the developer posts frequent updates. However, I deduct 1 star for it's lack of support for MS Exchange/Outlook. PJ Arts Smartphone Editor, Palm Addict blog

Lots of features, but looks like an old Android App. This app does mostly what I need. Dare I say it has too many features? It looks old and Androidish..like most apps, this email app has no style. I thought Android was easy to develop for? Anyway, a major drawback is that it does not automatically hyperlink dates and times within received emails. In the stock iOS mail app..if I click on a date that someone typed it will let me add a calendar entry right then and there. It certainly does not get 5 stars.

Best email client No doubt, this wins hands down. I use email professionally and I couldn't live without it. UPDATE: two stars less because an unfixed known bug causing crash in message multi-selection happening in 5.1. K9 has fixed it since v5.003. Honestly, one year without update doesn't sound right! Sent a support request, if no replies, one star removed each week of delay, at one, uninstall will happen and goodbye.

App is dead. No support....(update) 9/10/14-Just gave it another try. Still has stability issues and connect issues. Have tried to email support but no answer! Received auto response, but no help. 8/1/14-Have used for years. Has been the best mail app but has not made the changes required to stay on top of it's game. Lately, I have had many forced closed sessions. I have uninstalled and moved on to AquaMail Pro. Sorry to see you go Kaiten! Maybe someday you will catch back up?

Was 5 stars, now "left for dead" I loved this email app, bought the pro version, and used it happily for a long time. Sadly, the dev seems to have moved on. It still works well on 4.X, but it has some idiosyncracies on lollipop that I couldn't live with, so I moved away from it to Aquamail, which is actually quite a bit better, and the free version includes most features your average person would use.

Good but unreliable for push mail It's a pretty good app but it doesn't seem very reliable for pushing Gmail. Sometimes there's a pause of up to half an hour before it shows emails that should have been pushed instantly. And if I manually pull down to refresh, it often hangs and I have to force quit and then restart. The documentation and settings could also do with an overhaul as they're so convoluted and not clear (what exactly is "gaudy animation"???)

Horrible after recent changes Used to be one of my favorite apps but now it is extremely slow and frequently unresponsive. The delete confirmation in list view has been removed, and the new interface is not as nice as the old one was.

Was great, but crashes repeatedly on Lollipop. Project appears abandoned. Great app, but even after years, the backup does not save account ordering, nor which account is the default, nor the passwords, nor does it tell you *on the initial setup* when your passwords are wrong. THE APP ALSO CRASHES A DOZEN TIMES A DAY and has been doing so for at least a year. As of March 2015, long after the release of lollipop, the app hasn't been updated in one year. This app appears abandoned. .... Update: I finally found a comparable replacement: AquaMail. AquaMail even has decent support forums.

Ruined This was a wonderful email app until they stopped supporting it (last update: March 2014). On a fully up to date Nexus 7, it is now impossible to select messages without the app crashing, rendering it pretty much worthless. No response from the developers. What a shame.

Catastrophic Security No S/MIME, no PGP/MIME (=no encrypted attachments + other drawbacks), no encrypted drafts, no always encrypt/sign lists for contacts, no automatic key fetching, no PGP trust handling, meta-refresh privacy bug and no improvements over ages It's nice that some apps with a pure closed source core have a better way to do it, while I won't trust them.

It used to be great. I've depended on Kaiten for years and while it still works fine 85% of the time, the parts that are now broken with Lollipop devices are increasingly annoying. For instance, you can't click on a link in an email. When you do, you get the error net::ERR_CACHE_MIS Also, most of the time, an HTML email will not display until you tilt the phone and then tilt it back to its original position. Sure, Lollipop is still buggy, but these issues aren't appearing in other mail apps that are being actively maintained. This was once a great app. If you have a modern phone, it's sadly not useful any more. (GS6 Edge, Xperia Z Tablet)

A solid option to stock email app I had some issues when using third party keyboards with the stock email app and I have tried several apps to replace it. I keep coming back to this one though, the rest lack the sense of stability that this one offers.

Was great on Samsung s4 I used this on a Samsung s2 3 and 4 and it was great. Smooth and fast. Now on an S5 it is slow, clunky and does not update to the imap consistently. Very frustrating. Settings are the same as the S4 which still runs the software great. ---- updating review - - - On the s5 it will not delete emails from the imap. Very frustrating having emails reappear over and over. Also duplicate emails are appearing. Moreover navigation with with star and unread messages does not work.

(Almost) the best email on Android Have been using Kaiten Mail for years I have always been satisfied with the whole package (how it works & UX). However just recently I ditched my Yahoo mail - which never ever could do Push sync - and got Outlook instead. Only to find out Kaiten is the only app that doesn't support Push with Outlook... I don't know exactly how it works with exchange, but I would be grateful if we could finally get this to work (we're in the year of 2015 goddammit) Great work you can do better!

The UI is outdated. Horrible UI. Download free best myMail app.Why are you not following the new design concept of expandable menu like facebook, google plus, evernote, etc. Navigating between account is a hell. One has to go back twice to bypass the folder list and come forward. There are still too many clicks to change the account. No thought given for design for gestures. Its designed like a old tap interface.The chrome(navigation bars) take unnecessary space on the UI. There are too many columns on the list view.

Originally bought to support k9, but no updates I can't even remember why I originally bought this app two years ago, but I think I thought that the money would fund development both to Kaiten and k9 mail. Fast forward to now and k9 gets constant updates. This app hasn't been updated since March 2014. Not sure whether anyone should bother with Kaiten anymore, seems to be dead.

Could be much, much better. App crashes with alarming regularity. Shame, because I truly like it's interface. Hope developers will issue a fix soon. Won me over from Aqua Mail and I really don't want to revert. Stock Samsung client is like a hot dog without mustard. I use a Samsung Note 3 via VERIZON.

Totally useless customer service Still zero response from customer service; so infuriating that Kaiten can still promote itself as being a fine product. It is a zombie mailer. Beware no one is there and this absence doesn't care. Previous review two months ago ..... Works generally fine but help system useless; sends auto reply - contact you soon - and that's it. Happened 3 times. Am I only one to experience this hopeless non-service? So annoying that all PR shouts what a great mailer this is Jerome

Lollipop Compatibility Issues Life was good up until Lollipop. Loved the app. Better than any other. Now I cannot click links to launch external browser. It tries to open within the email client and fails. Hasn't been updated in almost a year and no reply from the developer. I bought the paid app thinking there'd be more attention to it. Apparently I need to start shopping again. :-\

Best Email App with Most Responsive Developer! Best Email for Android! Kaiten may share its base code with K9 but it's leaps and bounds ahead in the usability department and looks awesome. The developer listens and responds fast! 5 Stars! This has supplanted Outlook as my main mail client. FEATURED REQUEST: Full Conversation Mode with Sent Emails Showing.

Awesome.... Fixed Thank you I love the fact that these boys stay on their game when there's a problem with the app thank you keep up the good work.. PS... The new look is awesome.. I love it..been using this app since it was first released.. So I don't know what the hell all these other users are talking about..

Time to look elsewhere For me, both Kaiten and K-9 have always had a tendency to go into 'drain-the-battery-mode' a few times per year. It's been very bad the last few days and I've seen one other program that has some plausible explanations for this and has some workarounds. One of my favorite features was crippled in a recent update: previously, you had a wide choice of colors to identify accounts, now it is very limited.

NOT RELIABLE This app has several features I really enjoy, but it is terrible about syncing non Gmail accounts. The Gmail app actually syncs with outlook and Yahoo much more reliably than kaiten. I have missed clients' communication and lost income from this, I have had to apologize to family for not replying because kaiten didn't sync. DO NOT RELY ON KAITEN. To make it worse, the developer doesn't bother to reply to support requests; mine or forums full of people online. Deeply disappointing.

Has too may bugs I paid for this app more than a year ago and since have made many attempts to start using it on my smartphone and tablet rather than the stock email android app. It has never worked properly. Although boxes are checked for immediate deletion from server, deleted emails still remain on my other device. Also in my Gmail account, read messages continue to show as unread on one device but show as read on other. I liked the K9 Mail on my smartphone and wanted to use Kaiten Mail on my tablet and smartphone but I finally give up and will continue using the stock android email app which is very simple to use and without bells and whistles BUT works seamlessly.

App sucks -- Notifications STOP when using Galaxy Gear Absolutely zero help from "support" and I paid good money for this piece of #### app. Won't make that mistake again. "Support's" "fix" was for me to export and reimport my email accounts on the device that stopped getting notifications. They're also condescending and rude. They will never see another cent of my money.

No Text & Imbedded Image Issues I am still having problems with a small number of incoming emails having nothing in the body of the email and an actual statement that says "No Text". Need to add ability to imbed images on outbound forwarded emails. Will this ever happen!? Occasionally in the send process, polling continues indefinitely and runs the battery down if I don't check it and manually stop it. Those are my only issues. Otherwise Kaiten works perfectly.

Not Quite the Ticket Can't get gmail to work even though you know the logon details are correct? Nip over to your Google account in a browser, log in to your email, read the message telling you how they've (helpfully) blocked Kaiten as "insecure" and choose to allow less secure apps. Google- grow up FFS, and Kaiten, time you gave peeps a heads-up, not to mention an update. I smell Google and anti-trust here... Update: Kaiten has begun to freeze my S3 occasionally. Thank goodness I can pull the battery then!

Used to be very reliable.. Can't see the text. Never found anything better but from last 3 months the HTML email are intermittently invisible on my note 4 edge even on my colleagues phones aswell.. I am sure this is not phone or settings issue.. No content showing at all. I hope that i will get a reply from kaiten.. Kindly resolve thia issue ASAP.. Because i don't want any other app for emails.. I am giving 1 star because no latest update Recieved in last few months and getteing text invisibility problem on every email..